Optical detecting system for article counting machine

• US 4,680,464 A
• Filed: 11/27/1985
• Issued: 07/14/1987
• Est. Priority Date: 11/27/1985
• Status: Expired due to Term

• Current Assignee: Nova Packaging Systems, Inc.
• Original Assignee: Pennwalt Corporation (Arkema)
• Inventors: Bross, Charles F.
• Primary Examiner(s): LaRoche, Eugene R.
• Assistant Examiner(s): MIS, DAVID C
• Application Number:
  US06/802,548
• Time in Patent Office: 594 Days
• Field of Search: 250/222.1, 250/223 R, 250/561, 53/54-57, 53/73-74, 53/501, 221/2, 221/7
• US Class Current: 250/223.00R
• CPC Class Codes: B65B 57/10 responsive to absence, presence, abnormal feed, or misplacement of articles or materials to be packaged
• CPC Class Codes: G06M 7/02 wherein objects ahead of the sensing element are separated to produce a distinct gap between successive objects

Abstract

An optical detecting system for a machine for counting individual articles and delivering a preselected quantity of articles into receptacles. The system optically illuminates individual article receiving locations on an endless conveyor made up of elongated article receiving flights and produces optically-detectable indications of the presence or absence of an article at one or more article receiving locations. A reflector displays the optically-detectable indications to an optical detector, such as a camera, which generates an electronic signal representative of the optically-detectable indication. Associated circuitry generates a second electronic signal indicative of the presence or absence of an article in one or more receiving locations. The second electronic signal may be used to derive a count of articles delivered into the receptacles, and to actuate ejection of receptacles which are under-filled.

Claims

1. In a machine for counting individual articles and delivering a preselected quantity of said articles into a plurality of receptacles arranged in a rank, the machine having an endless conveyor having elongated article receiving flights adapted to receive, transport and discharge the articles into the receptacles, each article receiving flight having a plurality of spaced article receiving locations therealong, each for receiving a single article and corresponding to one of said receptacles, apparatus for detecting the presence and absence of individual articles in said article receiving flights prior to discharge, comprising:

(a) illuminating means for illuminating said article receiving locations with an optical beam for producing optically-detectable indications of the presence or absence of an article in one or more individual article receiving locations,

(b) reflective means for displaying said optically-detectable indications,

(c) optical detector means operatively associated with said reflective means for detecting said indications and for generating an electronic signal representative of said indications, and

(d) processor means for processing said electronic signal and generating in response thereto a second electronic signal indicative of the presence or absence of an article in one or more individual article receiving locations.

2. Apparatus according to claim 1, wherein said illuminating means comprises an elongated aperture arranged adjacent the article receiving flights of said conveyor, the length of the aperture being at least as great as the length of said article receiving flights.

3. Apparatus according to claim 1 wherein said article receiving locations include an opening therethrough and said optical beam is arranged to pass through said opening in the absence of an article in said opening and produce an optically-detectable indication in the form of an illuminated area on said reflective means.

4. Apparatus according to claim 1, wherein said optical beam is in the infrared portion of the spectrum.

5. Apparatus according to claim 1, wherein said optical beam is in the visible portion of the spectrum.

6. Apparatus according to claim 1 wherein said reflective means comprises an elongated reflective screen.

7. Apparatus according to claim 1, wherein said optical detector means comprises at least one camera arranged to view the optically-detectable indications displayed on said reflective means.

8. Apparatus according to claim 7, wherein said at least one camera comprises a solid-state imaging system.

9. Apparatus according to claim 7, wherein said optical detector means comprises two cameras, each camera arranged to view at least a portion of the optically-detectable indications displayed on said reflective means.

10. Apparatus according to claim 1, further comprising means responsive to said second electronic signal for generating one or more count signals indicative of the total number of articles delivered to individual receptacles.

11. Apparatus according to claim 10, further comprising means responsive to said count signals for ejecting an individual receptacle when the total number of articles delivered to said receptacle is below a predetermined minimum.

12. Apparatus according to claim 1 further comprising means responsive to said second electronic signal for generating an operator-detectable indication of the presence or absence of an article in one or more individual article receiving locations.

13. Apparatus according to claim 12, further comprising operator-actuatable means for ejecting a receptacle corresponding to an empty article receiving location when said operator-detectable indication indicates the absence of an article in said article receiving location.

18. Apparatus according to claim 7, wherein said at least one camera comprises a solid-state imaging system.

19. Apparatus according to claim 7, wherein said optical detector means comprises two cameras, each camera arranged to view at least a portion of the optically-detectable indications displayed on said reflective means.

14. In a machine for counting individual articles and delivering a preselected quantity of said articles into a plurality of receptacles arranged in a rank, the machine having an endless conveyor having elongated article receiving flights adapted to receive, transport and discharge the articles into the receptacles, each article receiving flight having a plurality of spaced article receiving locations therealong, each for receiving a single article and corresponding to one of said receptacles, apparatus for detecting the presence and absence of individual articles in said article receiving flights prior to discharge, comprising:

(a) illuminating means for illuminating said article receiving locations with an optical beam for producing optically-detectable indications of the presence or absence of an article in one or more individual article receiving locations, said illuminating means having an elongated aperture arranged adjacent the article receiving flights of said conveyor, the length of the aperture being at least as great as the length of said article receiving flights,

(b) a reflective screen for displaying said optically-detectable indications,

(c) at least one camera arranged to view the optically-detectable indications displayed on said reflective screen and for generating an electronic signal representative of said indications,

(d) processor means for processing said electronic signal and generating in response thereto a second electronic signal indicative of the presence or absence of an article in one or more individual article receiving location,

(e) means responsive to said second electronic signal for generating one or more count signals indicative of the total number of articles delivered to individual receptacles,

(f) means responsive to said count signals for ejecting an individual receptacle when the total number of articles delivered to said receptacle is below a predetermined minimum;

(g) means responsive to said second electronic signal for generating an operator-detectable indication of the presence or absence of an article in one or more individual article receiving locations; and

(h) operator-actuatable means for ejecting a receptacle corresponding to an empty article receiving location when said operator-detectable indication indicates the absence of an article in said article receiving location.

15. Apparatus according to claim 14 wherein said article receiving locations include an opening therethrough and said optical beam is arranged to pass through said opening in the absence of an article in said opening and produce an optically-detectable indication in the form of an illuminated area on said reflective screen.

16. Apparatus according to claim 14, wherein said optical beam is in the infrared portion of the spectrum.

17. Apparatus according to claim 14, wherein said optical beam is in the visible portion of the spectrum.

20. In a machine for counting individual articles and delivering a preselected quantity of said articles into a plurality of receptacles arranged in a rank at a filling location, the machine having an endless conveyor having elongated article receiving flights adapted to receive, transport and discharge the articles into the receptacles, each article receiving flight having a plurality of spaced article receiving locations therealong, each for receiving a single article and corresponding to one of said receptacles, and having a conveyor for conveying said receptacles past a discharge location, apparatus for detecting the presence and absence of individual articles in said article receiving flights prior to discharge, comprising:

(a) illuminating means for illuminating said article receiving locations with an optical beam in the visible portion of the spectrum for producing visible indications of the presence or absence of an article in one or more individual article receiving locations, said illuminating means having an elongated aperture arranged adjacent the article receiving flights of said conveyor, the length of the aperture being at least as great as the length of said article receiving flights;

(b) an elongated reflective screen for displaying said visible indications;

(c) a pair of solid state imaging cameras, each camera arranged to view at least a portion of the visible indications displayed on said elongated reflective screen and for generating an electronic signal representative of said indications;

(d) processor means for processing said electronic signal and generating in response thereto a second electronic signal indicative of the presence or absence of an article in one or more individual article receiving locations;

(e) means responsive to said second electronic signal for generating one or more count signals indicative of the total number of articles delivered to individual receptacles;

(f) means for tracking individual receptacles from said filling location to said discharge location and for generating a position signal indicative of the position of said individual receptacles;

(g) means responsive to said count and position signals for ejecting an individual receptacle at said discharge location when the total number of articles delivered to said receptacle is below a predetermined minimum;

(h) means responsive to said second electronic signal for generating an operator-detectable indication of the presence or absence of an article in one or more individual article receiving locations; and

(i) operator-actuatable means for ejecting at said discharge location a receptacle corresponding to an empty article receiving location when said operator-detectable indication indicates the absence of an article in said article receiving location.

21. Apparatus according to claim 20 wherein said article receiving locations include an opening therethrough and said optical beam is arranged to pass through said opening in the absence of an article in said opening and produce an optically-detectable indication in the form of an illuminated area on said reflective screen.